But the budget would boost defense spending. The military stands to gain $54 billion in funding.

The Department of Homeland Security would also see a nearly 7 percent jump in funding. That's expected, given Trump's executive order that calls for the ramp-up of detentions and deportations, as well as the construction of a southern border wall.

As Trump's chief strategist said last month, the administration's agenda includes the "deconstruction of the administrative state." That's apparent in the proposed elimination of jobs in environmental programs.

The White House is expected to release a more detailed budget that will include tax proposals in the coming months. House and Senate committees will now assess Trump's budget. It's just the first step in a monthslong process before the new fiscal year starts in October.